Home / 20,881.49-28,817.63-12,388.64

Finding the Fourth Proportional to 20,881.49, 28,817.63 and 12,388.64

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Solution

The fourth proportional to 20,881.49, 28,817.63 and 12,388.64 is: 17,097.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,881.49 : 28,817.63 = 12,388.64 : x
  2. Step 2: Convert to fraction form
    20,881.49/28,817.63 = 12,388.64/x
  3. Step 3: Cross multiply
    20,881.49x = 28,817.63 × 12,388.64
  4. Step 4: Simplify right side
    20,881.49x = 357,011,037.69
  5. Step 5: Solve for x
    x = 357,011,037.69/20,881.49
  6. Step 6: Final answer
    x = 17,097.01

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.